org.bouncycastle.jcajce.io
Class MacOutputStream

java.lang.Object
  java.io.OutputStream
      org.bouncycastle.jcajce.io.MacOutputStream

public final class MacOutputStream

extends java.io.OutputStream

An output stream which calculates a MAC based on the data that is written to it.

Constructor Summary

MacOutputStream(javax.crypto.Mac mac)
Base constructor - specify the MAC algorithm to use.

Method Summary

byte[]	getMac() Execute doFinal() and return the calculated MAC.
void	write(byte[] bytes, int off, int len) Write a block of data of length len starting at offset off in the byte array bytes to the stream.
void	write(int b) Write a single byte to the stream.

Methods inherited from class java.io.OutputStream

close, flush, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MacOutputStream

public MacOutputStream(javax.crypto.Mac mac)

Base constructor - specify the MAC algorithm to use.

Parameters:

mac - the MAC implementation to use as the basis of the stream.

Method Detail

write

public void write(int b)
           throws java.io.IOException

Write a single byte to the stream.

Parameters:

b - the byte value to write.

Throws:

java.io.IOException - in case of failure.

write

public void write(byte[] bytes,
                  int off,
                  int len)
           throws java.io.IOException

Write a block of data of length len starting at offset off in the byte array bytes to the stream.

Parameters:

bytes - byte array holding the data.

off - offset into bytes that the data starts at.

len - the length of the data block to write.

Throws:

java.io.IOException - in case of failure.

getMac

public byte[] getMac()

Execute doFinal() and return the calculated MAC.

Returns:

the MAC calculated from the output written to the stream.